Chuck-unit with replaceable jaw insert



July24, 1951 f Y lH. E. sLoAN 2,562,067

CHUCK-UNIT WITH REPLACEABLE JAW-INSERT Filed May 1e, 1949 1b zu i. 3 f, ,H v .-3 .if 5% J Patented July 24, 1951 CHUCK-UNIT WITH REPLACEABLE JAW SERT Harry E. Sloan, Hartford, Conn., assignor to The Cushman Chuck Company, Hartford, Conn., a corporation of Connecticut Application May 18, 1949, Serial No. 9,888v

'4 'Claims'. (Cl. 279-116) The present invention relates to improvements in chuck-'jaw units and relates more particularly to improvements in chuck-jaw units having replaceable gripping-face members.

It has heretofore been proposed to provide' chuck-jaw units with replaceable gripping-face members but all such prior structures have been open to such serious, objections as not to have come into general use. Among the objections referred to may be mentioned bulkiness of the structure required under old designs to secure iirm attachment of the parts, complexity and relative insecurity of the connections between such chuck-jaw units proper and their grippingface members.

One of the main objects of the present'invention is to 'provide' a 4superior chuck-jaw unit having a replaceable gripping-face member and -constructed and arranged so that the said gripping-face member is securely held against displacement under conditions of hard usage and vibration while being readily removable and replaceable when desired. Y

A further object of the present invention is to provide a superior chuck-jaw unit of the characterabove vreferred to and in which the connecting-means between the gripping-face member and the chuck-jaw proper is of such character as not only to be of adequate strength but to not require bulky structure, nor the dangerous weak` ening of its elements. f

With the 'above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art. l

Inthe accompanying drawings,f"inwhi`ch certainmodes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a central-longitudinal sectional view- 'of a chuck equipped with chuck-jaw unitsembodying the present invention; l A

' Fig. 2 is a view in side elevationl of oneof the chuck-jaw units detached;

Fig. 3 is a View looking toward the outer edge thereof; Y i i A Fig. 4 is a `topor Vplan view of the chuck-jaw unit; Y

Fig. 5 is a broken detailed sectional viewtaken on the line` 5- 5 of Fig. 4 but on a larger scale;v Fig. isa broken perspective sectional View of the chuck-jaw body taken on the same plane as Fig. 5 but omitting the gripping-face member andthe locking-screw; and Y fFig. 7 is a perspective view of the gripping-fac member detached.v

` For the purpose of making clear the utility of oneE form of chuck-jaw unit embodying the present invention,A there is illustrated in Fig. 1 a chuck which iscapableof utilizing such units. -The'said chuck includes a body which comprises, in the main, a front member I0 and a complemental rear member II both of ring-like form and rigidly secured together in any suitable manner (not shown) common in the art.l In the instance shown, there is accommodated within the front gear-teeth I4 just referred to is a socketed pinion I5 rotatable about an axis substantially perpendicular to the central-longitudinal axis of the body and carried by the Said body so as to be available for operation from the peripheral surl face thereof as is indicated in Fig. 1.

It will be clear to those skilled in the art that the particular form of chuck forms, in itself, no part ofthe present invention and the form of chuck shown yis chosen solely for purposes of illustrating the utility of the chuck-jaw units of the present invention.

In the instance shown, the front member I0 of the body is formed-with -a plurality of substantially-radial guideways I6 opening through the forward face of the said body and each formed intermediate its front and rear with guide-ribs such as I1 indicated in Fig. 1.

Mounted for reciprocation in each of the guide- Ways I6 is one of the desired number of corresponding chuck-j aw units generally designated by the reference character I8. Each of the similar chuck-jaw units comprises, in the main, a chuckjaw body I9, a gripping-face member or jawinsert 20 and a locking-screw 2l.

To enable the chuck-jaw units to be utilized in a scroll-type chuck, each chuck-jaw body I9 is formed on its rear face With a plurality of slightly-inclined transverse ribs 22 which interflt with the convolutions of the spiral rib I3 of the operating-scroll I2 to thereby enable each chuck-v jaw unit I8 to be concurrently moved radially inwardly and outwardly by a turning movement of the said operating-scroll-all in a manner well known in the art. opposite side faces, each chuck-jaw body I9 is formed with longitudinal guide-grooves 23-23 through the inner end of the chuck-jawl body, as

is especially well shown in Fig. 6.

The respective opposite side Walls of the holding-groove 24 are substantially parallel with each other and with the respective opposite side On each of its respective faces of vthe chuck-jaw body. `Preferably and as shown, the -innerend of the chuck-jaw 'body is' beveled in opposite directions as at 25--25.

Mounted in the holding-groove 24 in the inner end of each chuck-jaw body I9 With a snug slidor other Work-piece. In addition to, closely tting the respective opposite side Walls' 'of the holdinggroove 24, the gripping-face member 2|)Z has, its

inner surface firmly seated against the bottom of the, said holding-groove, as is especially Well shownuinFig. 5. L

Y, Extending diagonally in the inner portion of theA chuck-jaw unit |8-v is a screw-receiving recess which is formed partly in the chuck-jawl body 9 and partly in the gripping-face member 20 as will presently be described. The said screwreceiving recess comprises an inclined inner internally-threaded.portion or bore 28 formed Vin the chuck-jaw body |9 and intersected and interrupted by the holding-groove 24. The upper portion of the said threaded portion 28 is complemented in its` cylindrical cross-sectional form by an inclined clearance-notch 29 formed in the adjacent face of the gripping-face member as is especially well shown in Figs. 5 and 7. At the`- outer end of its threaded portion 28, the chuck-jaw body is formed with an inclined headclearance recess 39 Which, in turn, is intersected and interrupted by the holding-groove 24, as is especially Well shown in Fig. 6. The head-clearance recess 30 is of circularly-contoured form in cross section and is complemented by an inclined head-receiving notch 3| formed in the adjacent face of the gripping-jaw member, as is especially well shown in Figs. 5 and "1. The said head-receiving notch 3| is of a larger radius than the radius of the clearance-notch 29 to thus provide an arcuate clamping-shoulder 32 at the junction of the two said features 29 and 3|, which clamp- Y ing-shoulder faces generally toward the inner end of both the chuck-jaw body I9 and the gripping-face member 20 in substantial parallelism with the adjacent bevel 25 at the inner end of the chuck-jaw bodyIS.

As will be apparent from the foregoing considered in conjunction with the accompanying drawings, the inclined threaded portion 2S in the chuck-jaw body I9 and the inclined clearancenotchv 29 in the gripping-face member 20 complement eachy other to form a cylindrical socket for the reception of the threaded stem 33 ot the locking-screw 2|. Preferably and as shown, the surface of the clearance-notch 29 in the grippingface member 2D is left unthreaded, while preferably the threaded portion 28 in the chuck-jaw body |9 is` threaded throughout substantially lits entire length.

It will also be apparent from the foregoing that the head-clearance recess 39 in the chuck-jaw body I9 is complemented by the head-receiving notch 3| in the gripping-face member 20 to provide a substantially-cylindrical recess for the receptionof the head 34 of the locking-screw 2|, which latter is of cylindrical form as shown. In the instance shown, the head 34 is formed-in its outer end with a polygonal Wrench-receiving recess 35 adapted to receive a suitable Allen type wrench or other suitable tool, by means of which the entire locking-screw 2| may be rotated as desired.

Bymeans of the presentinvention, the chuckjaw .bodvlilL or its equivalentmay be `produced from readily-fabricated metal such as machinery Esteel, while the smaller gripping-face member 29 vv or its equivalent may be formed of relativelyard material such as hardened tool steel.

"When the gripping-face member is positioned rin Ithe holding-groove 24, the inner face of the head-340i the locking-screw 2| will seat against theclamping-shoulder 32 in the gripping-face member 20 and tightly bind the said member 20 'in place against displacement in all directions by a vclamping action which not only tends to move the said member 20 into tight engagement with the bottom of the holding-groove .24, but also to force the said member 2|) against the face of the holding-groove 24 opposite to the `face which is intersected by the head-clearance recess 3|).A lIt Will be noted that the bottom of the headclearance recess 30 vis located below the normal position of the clamping-shoulder 32 in the gripping-face member 20 so as not to check the inward movement of the locking-screw 2| but to permit the same to seat the underface of its head 34Y firmly against the said clamping-shoulder 32, asis indicated in Fig. 5.

rBy means of the features exemplied by the structure herein shown and described and in which the locking-screw 2| or its equivalent extends diagonally With respect to both the chuckjaw body I9 and the gripping-face member 29, not only are the members last mentioned not appreciably weakened, but the clamping action of the said locking-screw is rendered most effective and least liable to be loosened by vibration and hard usage. Furthermore, in accordance With the present invention, it is not necessary to make the chuck-jaw unit bulky in order to accommodate lsuitable means for rigidly assemblingv a 'gripping-face member with a chuck-jaw body.

The invention may be carried out in other specific ways than those herein set forth Without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming Within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. A chuck-jaw unit including in combination: a chuck-jaw body constructed and arranged to be mounted in a chuck, said chuck-jaw body having a holding-groove in one end extending in substantial parallelism With its opposite side faces, the said chuck-j aw body being further provided with a threaded bore located laterally intermediate of and inclined with respect to the saidside walls of the chuck-jaw body out of alignment with the transverse axis thereof and having one of its sides intersected and interrupted by-an inner corner of the said holding-groove, the said chuck-jaw body also having ahead-clearance recess formed in one side of its said holding-groove in axial alignment with the said threaded bore; a gripping-face member installed in the holdinggroove of the said chuck-jaw body and in turn formed in an inner corner'withan inclined clearance-notch registering with and vcomplementing the outer portion of .the threadedboreinrthe chuck-jaw body, the. said .gripping-face member also having an inclined head-receiving notch lccated outwardly of its said clearance-notchhand registering with Yand complementing .the headr clearance recess in the chuck-jaw body, the said head-receiving notch being larger in cross section than the said clearance-notch and 4the said gripping-face member having an outwardly-'facing clamping-shoulder at the junction of its said head-receiving notch and clearance-notch; and a locking-screw having a threaded stem passing through the inclined clearance-notch in the said gripping-face member into threaded engagement with the inclined threaded bore of the chuck-jaw body, the said locking-screw also having a head tting jointly into the inclined head-clearance recess in the chuck-jaw body and the inclined head-receiving notch in the said gripping-face member with the inner face of the said head seated against the said clamping-shoulder to lock the said gripping-face member in the aforesaid holding-groove of the chuck-jaw body.

2. A chuck-jaw unit including in combination: a chuck-jaw body constructed and arranged to be mounted in a chuck and having a holdinggroove in one end located intermediate its opposite side faces and extending in substantial parallelism with the said side faces, the said chuckjaw body being further provided with a threaded bore extending beneath the bottom of the said holding-grooves and inclined with respect to the side walls of the said holding-groove, the said bore having one of its sides intersected and interrupted by an inner corner of the said holdinggroove, the said chuck-jaw body also having a head-clearance recess formed in one side of its said holding-groove in axial alignment with the said threaded bore; a gripping-face member installed in the holding-groove of the said chuckjaw body and in turn formed in an inner corner with an inclined clearance-notch registering With and complementing `the outer portion of the threaded bore in the chuck-jaw body, the said gripping-face member also having an inclined head-receiving notch located outwardly of its said clearance-notch and registering with and complementing the head-clearance recess in the chuck-jaw body, the said head-receiving notch being larger in cross section than the said clearance-notch and the said gripping-face member having an outwardly-facing clamping-slroulder at the junction of its said head-receiving notch and clearance-notch; and a locking-screw having a threaded stem passing through the inclined clearance-notch in the said gripping-face member into threaded engagement with the inclined threaded bore of the chuck-jaw body, the said locking-screw also having a head fitting jointly into the inclined head-clearance recess in the chuck-jaw body and the inclined head-receiving notch in the said gripping-face member with the inner face of the said head seated against the said clamping-shoulder to lock the said grippingface member in the aforesaid holding-groove of the chuck-j aw body.

3. A chuck-jaw unit, comprising a jaw-body adapted for mounting in a chuck and having in one end thereof a groove extending depthwise longitudinally of said jaw-body; a jaw-insert removably received in said groove and having a work-gripping face outside said groove, said body and insert having recesses, respectively, which complement each other to form a bore extending from said one body-end on one side of said groove ,inwardly and inclined toward the longitudinal axis of said body to a depth beyond that of said groove, and being cross-sectionally enlarged at said one body-end to form shoulders in said body and insert, respectively, said bore being also tapped :at least over that length thereof which extends inwardly beyond the depth of said groove; and a screw threadedly received in said bore and having a head seated against said shoulder in said insert for releasably locking the latter in said groove.

4. A `chuck-jaw unit, comprising a jaw-body adapted for mounting in a chuck and having in one end thereof a groove extending depthwise longitudinally of said jaw-body; a jaw-insert removably received in said groove in fitted relation therewith and having a work-gripping face outside said groove, said body and insert having recesses, respectively, which complement each other to form a bore extending from said one bodyend on one side of said groove inwardly and inclined toward the longitudinal axis of said body to a depth beyond that of said groove, and being cross-sectionally enlarged at said one body-end to form shoulders in said body and insert, respectively, of which said insert shoulder is closer t0 said one body-end than the other shoulder, said bore being also tapped at least over that length thereof which extends inwardly beyond the depth of said groove; and a screw threadedly received in said bore and having a head totally received in said enlarged bore portion and being seated against said insert shoulder for releasably locking said insert in said groove.

HARRY E. SLOAN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

